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Police say 45 people died in the attack by unidentified gunmen on Egba village in in Benue state.
But local politician Audu Sule told the BBC 81 villagers had been killed by the attackers, who were all armed with Kalashnikov rifles.
Clashes between herdsmen from the Fulani ethnic group and farmers over grazing rights have plagued the region.
"They opened fire on the sleepy village, killing residents including women and children," Mr Sule said.
Police are hunting the attackers but no arrests have been made yet, state police spokesman Austin Ezeani told AFP news agency.
"This area has been volatile for some time," he said.
Benue has a history of violent attacks and reprisals between semi-nomadic herdsmen and farmers, sometimes in revenge for cattle raiding.
Last year, at least 100 villagers were killed in central Kaduna state in an attack linked to a dispute between local farmers and herdsmen.
Women and children are among dozens of people killed in a dawn raid on a village in central Nigeria.

Overnight leader Willett, 28, putted in from 15 feet to card a final-round 69 and win his fourth European Tour title.
Sullivan went round in 68 and had to settle for joint second along with Rafa Cabrera-Bello of Spain.
Defending champion Rory McIlroy hit eight birdies in a round of 65 and tied for sixth, four shots off the top.
Willett, who lost his overnight advantage when he bogeyed the second, went three clear after three birdies in four holes from the fourth.
A bogey on the ninth and 14th allowed the chasing pack to close the gap but Willett held his nerve to secure victory in a tense finale.
The win will lift him from 20th in the world rankings to a provisional career-high of 12th depending on the result of the Phoenix Open.
Willett moved third in the Ryder Cup standings and also took a step closer to qualifying for the British Olympic team.
"I'm just ecstatic," Willett said. "You can't buy that feeling, coming down the back nine, the last three holes, in contention in a golf tournament.
"You can't pay for that experience, you've got to earn it.
"You'd love to win by five or six every time, but when you win in that fashion it does feel that little bit extra special.
"It means when the pressure is on I can produce the goods."
England's Danny Willett birdied the final hole to win the Dubai Desert Classic by one shot from compatriot Andy Sullivan.

The military-style camp in Heydour, near Grantham in Lincolnshire, is a regular haunt for TV stars and cast members of TOWIE and Made in Chelsea.
But residents have complained it is too loud and creates too much traffic.
The camp, which had its planning application deferred on Tuesday, said residents had been "hostile" but they were working to resolve the issues.
Team Bootcamp, which is run by husband and wife Craig and Paula Williams, opened last year in the hamlet which only has eight properties.
It offers a range of military-style training and relaxation programmes, walks and accommodation at a Grade II listed house.
Paul Richardson, who lives nearby, said: "I just think it is the wrong place for something of that nature.
"I don't particularly like seeing the group coming round the village. The building should be used for offices or something that doesn't affect other people."
Mr and Mrs Williams said they had been unaware planning permission was needed to use the site for their camp and had submitted a retrospective application.
"The noise does travel really well here and we are aware of it," said Mr Williams, a former marine.
"We do spend a lot of time and energy keeping on top of the noise and the complaints and we have stopped using music and our trainers from shouting.
"I am used to hostile environments all over the world. The feeling I get when I walk through the village is the same... it's not nice."
The bootcamp has received 27 letters of objection from nearby residents, who said music blared from the site and it affected the local environment.
Councillors at South Kesteven District Council deferred making a decision on the application to a later date. They had asked for amendments to be made before planning permission would be granted.

A fitness camp popular with celebrities "destroys" the peace of a hamlet, some nearby residents have complained.

